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Aims <p>The formation of soil organic carbon (SOC) is a complex phenomenon mainly originating from plant- and microbial-derived C. Conservation tillage involving no-till and residue return (RR) has been widely practiced to enhance SOC, but the relative contributions of plant- and microbial-derived C to SOC under these practices are still unknown.</p> Methods <p>A global meta-analysis of 500-paired observations was used to identify the effects of no-till and RR on plant- and microbial-derived C and their drivers.</p> Results <p>The results showed that no-till increased microbial necromass C by 18.3%, and the contribution of microbial necromass C to SOC by 5.0%, whereas plant necromass C and its contribution to SOC remained unchanged under no-till. No-till increased the ratio of fungal to bacterial necromass C by 12.3%, indicating fungal necromass C contributes more to SOC. The microbial necromass C under no-till was increased the most at MAP &lt; 550&#xa0;mm, humidity index &lt; 85, medium-textured soil, acid soil, and initial C/N ratio ≥ 10 (<i>P</i> &lt; 0.05). Dissolved organic and microbial biomass carbon contributed to the formation of microbial necromass C and benefited the SOC accumulation. RR increased plant and microbial necromass C by 83.8% and 13.0%, respectively, and enhanced the contribution of plant necromass C to SOC by 64.1%. Greater plant-derived C was observed when the experiment duration was over 3&#xa0;years.</p> Conclusions <p>Our global meta-analysis highlighted that no-till can improve soil carbon stability (microbial-derived C) while RR can increase soil carbon quantity (plant-derived C). Conservation tillage (no-till and RR) is sustainable strategies through collaborative improvement of SOC capacity and quality.</p>

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Global synthesis on the responses of microbial- and plant-derived carbon to conservation tillage

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Yalin Yu,
  • Li Li,
  • Jinkang Yang,
  • Yinan Xu,
  • Ahmad Latif Virk,
  • Jie Zhou,
  • Feng-Min Li,
  • Haishui Yang,
  • Zheng-Rong Kan

摘要

Aims

The formation of soil organic carbon (SOC) is a complex phenomenon mainly originating from plant- and microbial-derived C. Conservation tillage involving no-till and residue return (RR) has been widely practiced to enhance SOC, but the relative contributions of plant- and microbial-derived C to SOC under these practices are still unknown.

Methods

A global meta-analysis of 500-paired observations was used to identify the effects of no-till and RR on plant- and microbial-derived C and their drivers.

Results

The results showed that no-till increased microbial necromass C by 18.3%, and the contribution of microbial necromass C to SOC by 5.0%, whereas plant necromass C and its contribution to SOC remained unchanged under no-till. No-till increased the ratio of fungal to bacterial necromass C by 12.3%, indicating fungal necromass C contributes more to SOC. The microbial necromass C under no-till was increased the most at MAP < 550 mm, humidity index < 85, medium-textured soil, acid soil, and initial C/N ratio ≥ 10 (P < 0.05). Dissolved organic and microbial biomass carbon contributed to the formation of microbial necromass C and benefited the SOC accumulation. RR increased plant and microbial necromass C by 83.8% and 13.0%, respectively, and enhanced the contribution of plant necromass C to SOC by 64.1%. Greater plant-derived C was observed when the experiment duration was over 3 years.

Conclusions

Our global meta-analysis highlighted that no-till can improve soil carbon stability (microbial-derived C) while RR can increase soil carbon quantity (plant-derived C). Conservation tillage (no-till and RR) is sustainable strategies through collaborative improvement of SOC capacity and quality.